Speed indicator and recorder.



W. N. MITCHELL. SPEED INDICATOR AND RECORDER.

APPLICATION FILED JULY 25, 1906. 960,568.

Patented June 7, 1910.

3 SHEETS-SHEET l.

I e 2 @ZWZVJM W. N. MITCHELL. SPEED INDICATOR AND RECORDER.

APPLICATION FILED JULY 25, 1906. 960,568.

3 SHEETSSHEBT 2.

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Patented June 7, 1910.

W. N. MITCHELL. SPEED INDICATOR AND RECORDER. APPLICATION FILED JULY 25,1906.

Patented June 7, 1910.

3 SHEETS-SHEET 3 B 0 0 4 1 h H x M 02%? Witness e 5 STAiES PATENTOFFICE.

WILLIAM H. MITCHELL, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE INTERNATIONALTEXT 1300K QOMPANY, F SCRANTDN, PENNSYLVANIA, A CORYDRATION 0F PENN-SYLVA'NTA.

To all whom it may concern;

Be it known that 1, WILLIAM N. Mrrcn- ELL, a citizen of the UnitedStatesftrnd resident of Chicago, county of Cook, and State of Illinois,have invented certain new and useful Improvements in Speed indicatorsand Recorders, of which the following is a description.

My invention relates to means for conveniently and continuouslyindicating the speed of a rotating body.

The object of my invention is to produce a simple, accurate, andthoroughly reliable device of the kind described and one that may beconveniently attached to the running gear ofan automobile or railway airto indicate the speed at which the Vehicle is moving.

To this end my invention consists in the novel construction,arrangement, and combination of parts herein shown and described andmore particularly pointed out in the claims. 7

In the accompanying drawings wherein like or similar referencecharacters indicate like or corresponding parts; Figure l is anelevation 01" my device shown operatively connected to a, suitable clockmechanism and battery. Fig. 2 is a side elevation of the indicatoroperating mechanism. Fig. is a section taken substantially on line 3 3of Fig. 2. Fig. i is a section taken substantially on line ls-4: of 3.Fig. 5 is a. section taken substantially on line 5--5 of Fig. l.

In the preferred form of my device shown in the drawings, 1 is a framefor holding the several parts of my device in operative relation andsecuring the same in position. A member 2 is rotatal'ily mounted uponthe frame '1' by means of the pivot screws, or other suitable bearings 33. Any suitable means may be provided for rotatively connecting themember 2 to the object whose speed is to be indicated. As shown a. shaft4: is rotatably connected to the object in any desired manner andprovided at its up per end with a gear 5 arranged to mesh with a gear 6fixedly mounted upon the member 2; the object being; to.continuouslyrotate themember 2, while indicating the speed of an object, at a speedbearing a certain known proportion to the speed of the obg ect,

Specification 0t Letters Patent.

Application filed July 52.5, 1906.

SPEED INDICATQE RECORDER.

l so that mechanism may be operated by the the speed of the objectconnected therewith.

Any suitable mechanism may be employed adapted to be periodicallyoperated by the member 2 for a fixed interval of time to indicate theextent of the movement of the member 2 during such interval and ifdesired by employing sntlicient-ly short intervals in rapid successionto produce practically continuous speed record of the member 2 and theobject to which it is .con nected. lfn the form shown, slide Y ismounted in suitable ways 8 and provided with a roller 9 or equivalentmeans arranged to engage the face of spiral cam 10 re tatably mountedconcentrically with, or upon a part of, the -membcr 2, which is shownmerely as a small shaft.

A stop 11 is arranged in the path of a portion. of the cam 10 and aspring 12 is provided to norn'ially hold. the part 10in a fixed positionin contact with the step. A spring 1.4 or other suitable means is alsoprovided extending from the slide 7 to a suitable point upon the frame 1tending to resiliently hold the slide at the inner end of the ways 8with the roller 9 in contact with the face of the cam '10.

As the cam 10 at the commencement of each interval is in contact withthe" stop 11, to indicate the extent of its movement during the intervalit is only necessary to indicate its position at the close of theinterval and it the indicating device is retained in this position for ashort tin'ie say until the connnencement of the next interval thechiliculties of accurately reading the indications of the device will begreatly reduced.

Any suitable means may be employed to temporarily arrest the returnmovement of the slide 7. As shown a brake lever 15 is pivotally mountedupon the frame 1 at 16 with a suitably formed part 17 arranged to engagethe slide 7 at any point in its travel and arrest its movement. aspring; 18' being provided at the opposite end o'f the. pal-tie tonormally hold thc same in eirgagrng po sition.

Suitable means are provided for releasing the slide 7 when desired. Asshown a i positioned to attract when energized, poi."

member 9 to accurately indicate or record temporary magnet 19 isprovided suitably binding posts 233 1'!" compress ihe the '3 ole me PSmay be provided so ,1 bly connect hie com Ill with the mem- As shown asimple liorm of eleeirio 1 provided '11 which l coils or wiuijiio s are'runged or iceniricully about the men'iber 2 as a core and between thecentral portions of the engaging or cluli-ch members 521 aml 22 whichare rigidly attached lo the member 2 and cam w respecl-ive I a frictionface being PIOVll'ltid' o of the clui'ch u'iembers adapted. w when thecoils 90 are GTIEIg'lZQLl lock the member 2 and part; 10

ill

, Lug posts 28, 23 are mount- ;i' the "Era; e 1 for a inching elecdu'iors ior energizing the coils 2?? and "he currenl may be conductedfrom the coils by any suit: As shown the ieruunals L ar atiaached in theC(Hli'hil rings "re concentrically mounted upon zicnilier 21 andinsulated there-- on: each oihc' by suitable insuc-ite Brush are pro I vscour the frame 1 and ically connected '60 he binding posts their freeends pressed Tirn'ily "t the conlaaci rings 26.

itilcry 24s may be connected to my de- "vice in any suitable tanner. i''is shown" one pole of in: battery 18 connected by a 36 or equivalentmeans d1- J r contmmor to one oi in iherc bv owning pa. inc tempman"i'he binding posts and.

ns of a conductor 3! "co a cached to one terminal of: i i m ,J

magnet. 11 ihe OPPOSIEQ pole of the i, a; is connccicd by means of aconductor 58 directly to a time switch and from there by the conductors239 and 40 to and 29 at the opposite tcrn'iinals of the coils 2:) andmagnet 19 respeclii voly.

"The time switch may be of any preferred form of construction in theform shown suitable clock mechanism 30 is provided 0 rotate ari'n 31which is preferably arranged to make one rotation in a minute and apairof rings 32 and 42 are rigidly fixed upon the 'iranie of the clockmechanisn'i so l'hai their faces which. are each composed alternately oiconducting and non-conducting material 33 and coht'eci; with pi' rticnsof he arm 31. In the form shown the parts of the outer ring 32 aresubstantially ii'iur cimcs the length of the pai-ls 8 and twelve of eachmake up the comple'ie ring. In the inner ring 4:2 which carefullyinsulated from the outer the parts 35 are mere poinls separated by theparts 34 each pair comprising' one twelfth the face of the ring. Therings 32, 42 beso positioned that as the arm 31 revolves respectivelyare in the part of that when constructed the electric circuit to closedevery live seconds and remain closed for an interval of sub stantiallyfour seconds after which it 11: mains open for one second before it isagain closed and that just before the circuit to the coils 20 is brokenthe circuit to the teinporary magnet, 19 is closed momentarily. By thisarrangement when my device is placed in operaiion the circuit to thecoils 20 closed and the cam rota-ted 'W'ii'h the member 2' engaging theroller 9 and forcing ihe slide 7' outward against the resistance of hespring 1% and brake 15, this continues for an infer-val, of nearly fourseconds when the brake released for a H'lOll'lGlli; per-- mitting; theslide to adjustitself under the pressure oi? the sprizn l4 only, whenthe brake i5 is again applied and the cam returns to its startingposition leaving the slide held by the brake. After the lapse of secondthe cam 10 is again engaged and rotated by the member 2 and, in case thespeed has increased, operates the same as before after the cam faceengages the roller 5), in case however the speed has decreased the camwill not; move far enough for its face to engage the roller'f) so thatwhen the brake 15 is released the slide 7 will move inward a distance(JOI'IGSlNHltliUg to the diffcrence in speed, thus constantlyindicatingby its position the distance through which the cam it) roiaiedwhen last engaged by the switch.

If desired the ways upon which the slide 7 operates may be iduatcd andthe speed, indicated by the position of the slide, read directlytherefrom or an indicating or recording mechanism may be arranged in anydesired manner to be. operated by the slide. As shown a chart, or scaleis provided and a pointer 46 attached to the slide 7 by means of a rod47 and lever 48 is provided to indicate upon the scale the position ofthe slide. Obviously if a suilablc shoot; of paper 35 or similarmaterial is substituted for the scale with suitable means to move thesheet, and a, pen, pencil or other marking point; is employed, in placeof the pointer 4-6, the variations in speed will be indicated upon thepaper 35 as a permanent record.

In the foregoing specification my device is explained as a device forindicating the speed of a rotating shaft or other object, the principaluse however to Whic it has been applied so far has been to indicute therelative speed of various )LIIIS of vehicle wheels",

it reaches the end of Y and knowing the diameter of the wheels to recorddirectly upon the sheet 35 the linear speed of the vehicle, and whilethe preferred form of-my im rovernent is *herein shown and described, itis, obvious that various slight modifications 'may be made in my devicewithout departing from the spirit of my invention, hence I do not wishto be I understood as limiting myself to the exact form and constructionshown.

What I claim as new, and desire to secure by Letters Patent is 1. In adevice of the kind described, a rotatable member, a rotatable partmounted concentrically with said member, means for rotating said member,a stop positioned in the path of said part, means attached to said parttending to normally hold the same against said sto in combination withmeans rigidly mounte upon said member for periodically connecting saidpart and member for a predetermined interval, a slide arranged tomovelongitudinally at each rotation of said part, and means arranged toengage said slide tending to revent its movement but releasing the slideat the completion of each partial rotation of said part.

2. In a device oi the kind described, a tatable member, a rotatable partmounted concentrically with said member, means forrotatmg said member, astop positioned in the path of said part and means attached to said parttending to normally hold the same a ainst said sto in combination withmeans rigidly mounte upon said member for periodically connecting saidpart and member for a predetermined interval, a slide arranged to movelongitudinally a distance .corresponding to the arc of rotation of saidpart, and means arranged to engage said slide to prevent its movementbut releasing said slide at the completion of each partial rotation ofsaid part.

3. In a device of the kind described, a rotatable member, a camconcentrically and loosely mounted upon said member, a stop positionedin the path of a portion of said cam, and resilient means tending tonormally hold said cam against said step, in

combination with mechanism rigidly mol'ut ed upon said member andarranged to-periodically connect said cam and member for a predeterimncdperiod, a slide adapted to be moved longitudinally by said cam, and a--brake arranged to periodically engage said slide and hold the same inposition to indicate the extent of movement of said cam during a portionof the next partial rotation of said cam. p

t. In a device of the kind described, a

loosely and concentrically upon said memher, a stop positioned in thepath of said cam, means for rotating said member, and resilient meanstending to normally hold said cam-against said stop, in combination withmeans for periodically connecting said cam and member for apredetermined interval, a slide adapted by its position to indicate themovement of said cam, resilient means tending to hold said slide incontact with said cam, and a brake arranged to engage said slide andprevent its .movement toward said 'cam. until the cam nears theoperative limit of its movement.

In; testimony whereof, I. have hereunto signed myname in the presence oftwo subscribing witnesses.

VILLIAM N. MITCHELL.

Witnesses BURTON U. HILLS, CHARLES I. Conn.

so rotatable member, a spiral cam mounted

